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Summary of Proceeds and Realized Gains/(Losses) on Equity Securities and Certificates of Deposit (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Duration Of Unrealized Losses On Equity Securities [Line Items] |  |  |
Proceeds | $ 10,654 | $ 12,950 | $ 9,327
Gross Realized Gains | 13 | 124 | 6
Gross Realized Losses |  |  |

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- Definition Gross realized losses on non-marketable certificates of deposit and other securities. + References No definition available. + Details
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- Definition Proceeds from sale of non marketable certificates of deposit and other securities. + References No definition available. + Details
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